Apple to orange comparison, but I run many boats and one has a 210 Cummins in a Nordic Tug 32 and it will run 17 knots and burn roughly 13 GPH, but that's a 15,000lb boat. I would expect the Seacraft to benefit from the weight advatage on speed. While mechanical injection is not as good as the new electronic QSB series, there is not much smoke to contend with. I like the lifespan of the motor of 15K - 20K hours that most Nordic owners are seeing before any intensive maint/overhaul.
I'm sure that boat would be very economical to run.
D-